Sentence Correction

According to anthropologists, the use of human language covers a wide spectrum from practical communication between people engaged in the same task to establishing hierarchy within a social group.

practical communication between people engaged in the same task to establishing hierarchy

communicating practically between people engaging in the same task to the establishment of hierarchy

practical communication between people engaged in the same task to the establishing of hierarchy

communicating practically between people engaging in the same task to hierarchy established

practical communication between people engaged in the same task to the establishment of hierarchy

OA is E

I was going through the MGMAT SC guide advanced parallelism and found that Concrete nouns cannot be parallel to Action nouns. However Action nouns can be parallel to Complex Gerund.

Now applying the same principle -

Communication is Action noun,

Establishing Hierarchy is Simple Gerund

The Establishment (Not sure but sounds like a concrete noun)

A - Action Noun Vs Simple Gerund (Wrong)
B - Simple Gerund Vs Concrete (Wrong)
C - Action Noun Vs Complex Gerund (Correct)
D - Just Wrong
E - Action Noun Vs Concrete Noun (Wrong)

Now I am doing some mistake here, either classifying the noun type or reading the rule incorrectly. Can someone please enlighten me?